At 55" it's a TV, not a monitor, not even if it's curved. We all know curved TVs were a thing a few years ago btw. A monitor is a screen you sit usually an arm of a distance (80cm) set behind your keyboard and at that distance 40" is the maximum size a pixel is invisible to a 20/20 eyesight at 4K resolution, let's round it to 42" or 48" depending on your arm size lol, also 40" doesn't exist. I don't know why companies decided 32" is the good size for 4K when it's not, it's 40" really. So anyway.. anything over 42" may universally be declared as too big for a monitor then, except 48" if you sit a little behind just like you do with a 24" Full hd which is also the limit for that given resolution. TVs on the other hand are set at double arm distance min (1.60m) and at that length it only gets too big over 80" if it's 4K. Funny to think though that a 48" Full HD is exactly the same as a 48" 4K if you sit more than 1.60 away from it.
20/20 vision at 80cm equals 20" for 1080p, 27" for 1440p and 40" for 4K. If you multiple the distance you multiply the screen size the exact same value. So if there was a 55" 1440p TV at 1.60m it would be indistinguishable from a 55" 4K TV because at 20/20 that's the max resolution you can see. Another fun fact.. if you google "most immersive FOV", for that "cinematic" experience it's said that around 40° is the magic number, which is exactly a 27" FOV at 80cm. So not only 27" 1440p is the only monitor that perfectly matches pixel density for it's size compared to a perfect vision but it's also the only that perfectly matches most immersive FOV for watching content. At 40" and 80cm you have the exact pixel density but the FOV is way higher at 60°.. that may feel nauseous for some people, but with a monitor at this size you can set the resolution to 21:9 or even wider to decrease the FOV or you can also simply sit a bit behind, like let's say 1.2m which would bring the FOV down back to 40°, and that of course only as a hard measure if the game doesn't have a FOV slider or you decide to watch a movie. At 55" a 1440p resolution would match pixel density and 40° FOV at 1.60m, wonder why we don't have this resolution for TVs
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